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Tool Talk Discussion Forum

Re: M1 .30 Carbine

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07-31-2020 04:11:16

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> Your comparison is kind of apples to oranges, though, due to likely barrel length discrepancies of those tests. Would need to compare data on the 30 Carbine out of a handgun chambered for it. Or compare the 30 Carbine from a rifle to 357 or 45 ACP out of a pistol caliber carbine. To do a true comparison, the barrel lengths need to be equal.

You do have a point, although old didn't say his comparison used identical barrel lengths. I just assume he meant the different cartridges were being fired in the guns in which they're most commonly chambered: M1 carbine, revolver and M1911A1.

According my Lyman manual, the .357 Magnum has an astounding 1800 fps muzzle velocity out of a 20" Model 94. That 45 percent increase in velocity gives it a 111 percent increase in energy and a 45 percent increase in momentum, putting the 357 at the top of the heap. Much of that velocity increase is probably from eliminating the revolver's cylinder gap.

The .45 ACP is another matter. It has a modest powder capacity and a very big bore, so it requires pretty fast powders like Unique. Fast powders don't yield much additional velocity with longer barrel length. (357 and 30 carbine use slower powders like H110 which is why they benefit from longer barrel length.) Referring to the Ballistics by the Inch site, we see that a 16 inch barrel only increases the .45's velocity by 14 percent over a four inch barrel. That's not nearly enough to overcome its 3 to 1 disadvantage in muzzle energy versus the .30 carbine. In fact, the .45 actually SLOWS DOWN if the barrel is longer than 16 inches!

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